I am working on a project that has data from 2017 up till now and data will be added every day. Most of my metrics depends on weekly and yearly performance.

The fiscal year starts on Thursday of the second week of February. I want to set this as my start date. The default options gives you to set the month and the week start day, which always start from the 1st week of that month. How can I set the start date to start from the second week of that month on a Thursday?

Actually data gets added to the database every day and I need to compare weekly performance of year 2017 to 2018. Right now we are at week 23 of 2018, so I am comparing week 23 of 2017 and 2018. I have uploaded the dashboard on tableau online. Now when data for week 24 will be added, Tableau will include the data for week 24 in the filter but won't select it automatically. I will have to manually go online and select the week 24 to show week 24 performance.

Tableau came up with the above shown option but only works for date values.